File _service of Package brp-extract-appdata

<services>
  <service name="tar_scm">
    <param name="url">https://github.com/doccaz/brp-extract-appdata.git</param>
    <param name="scm">git</param>
    <param name="versionformat">%ad</param>
    <!-- param name="changesgenerate">enable</param -->
    <param name="revision">new_variable_name</param>
  </service>
  <service name="recompress">
    <param name="file">*.tar</param>
    <param name="compression">xz</param>
  </service>
  <service name="set_version"/>
</services>